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  1. #include<bits/stdc++.h>
  2.  
  3. #define    pi          acos(-1) 
  4. #define    all(x)      (x).begin(),(x).end()
  5. #define    fill(x,y)   memset(x, y, sizeof(x))
  6. #define    trace(x)    cout << #x << " = " << x << endl
  7. #define    bug         cout << "Bug check" << endl
  8. #define    endl        '\n'
  9.  
  10. using namespace std;
  11.  
  12. int main(){
  13. 	//freopen("in.txt","r", stdin);
  14. 	//freopen("out.txt","w", stdout);
  15.  
  16. 	//ios::sync_with_stdio(0);
  17. 	//cin.tie(0);
  18.  
  19. 	int n; cin >> n;
  20. 	double r; cin >> r;
  21.  
  22. 	vector < pair<double,double> > v(n);
  23.  
  24. 	for(int i=0;i<n;i++){
  25. 		double x,y; cin >> x >> y;
  26. 		v[i].first = x;
  27. 		v[i].second = y;
  28. 	}
  29.  
  30. 	double d = sqrt((v[0].first-v[n-1].first)*(v[0].first-v[n-1].first) + (v[0].second-v[n-1].second)*(v[0].second-v[n-1].second));
  31.  
  32. 	for(int i=0;i<n-1;i++){
  33. 		d+= sqrt((v[i].first-v[i+1].first)*(v[i].first-v[i+1].first) + (v[i].second-v[i+1].second)*(v[i].second-v[i+1].second));
  34. 	}
  35.  
  36. 	d+= n*(2.0*pi*r/n);
  37.  
  38. 	printf("%.2lf\n", d);
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 4444KB
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https://ideone.com/t1M3rK
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
secret

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